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Old 12-27-2010, 01:11 PM   #1
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Jeep tj 4.0 I6 motors??

I have a 2004 Rubicon. I lost cylinder 1 about two weeks ago. I have been trying to do a little research on the engine's from the 97-00 and the 01-06. What is the difference if any between these to motors? I have a friend with a 99 he is willing to sell me. The reason I am curious is when I call the salvage yards the is a 6-800 dollar price difference between those model year engines and I want to know what the difference is and if I would be a easy swap or is it two entirely seperate motor configurations? Any tips or advice would be greatly appreciated

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Old 12-27-2010, 01:17 PM   #2
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By lost you mean what? It's not firing? You burnt a hole in the piston? Or the connecting rod broke and you cross ventilated the block?
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Old 12-27-2010, 01:20 PM   #3
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Beginning the '00 year I think they changed the head design slightly.
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Old 12-27-2010, 01:25 PM   #4
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i know in 2000 they went to distributorless ingition. That is the most major difference I can think of. Not sure what else may have changed.
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Old 12-27-2010, 01:30 PM   #5
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What I ment by lost cylinder one, blew the cap off the connecting rob through the oil pan.
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Old 12-27-2010, 02:01 PM   #6
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what was the mileage on the engine when it let loose ?
What were you doing at the time ?
Where are you located ?

sorry for all the questions ... just curious

I've got a 1999 4.0L six with 117,xxx on it
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Old 12-27-2010, 04:41 PM   #7
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Driving through titusville doing 55, had about 115xxx on it
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Old 12-27-2010, 07:56 PM   #8
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Tough one.
The bottom ends should be the same and interchangeable. The heads, FI and ignitions are different. You could take the older short block and swap on your top end. You'll need the newer cam, I would get new cam and bearings and use that.
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Old 12-27-2010, 08:29 PM   #9
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there is something different in the way the AC mounts. I believe
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Old 12-28-2010, 03:01 AM   #10
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the 97-99 4.0Ls have a normal distributor, no 2 Cat converters on the exhaust manifold, An older style less efficient intake manifold, and different computer settings and I believe they changed the valve timing and or the cam for 00-06. For 00-06 they changed to the rail distribution, put two cats on the exhaust manifold, changed the computer settings and made it more emissions "friendly". To compensate for power loss they put on a newer style intake manifold.
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Old 12-28-2010, 03:15 AM   #11
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you said titusville, if so im real close and we need to go wheelin when your close, i know a ton of trails and i got a few friends on tap
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Old 12-28-2010, 10:47 AM   #12
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Thanks for the advice everyone, and when I get it running again it will deffinitly be making its way back out to 5a, but no mud like always until I get another dd

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